Can a tax attorney with expat/international experience please point me in the right direction?

you should use the find a lawyer tab or google and search for an attorney. We can not solicit our services on this forum. You should deal with this...

Are people WHO dont work or dont have any income. (gets taken care by family) have to file tax return?

Depends if you are making any money, as my colleagues have pointed out filing has ramifications on a statute of limitations. If you make any money...

Can the $250k/$500k personal residence exclusion from LTCG tax apply to a tax event affecting basis but not pursuant to a sale?

Capital gains exclusions only apply if there would be capital gains, The Personal residence one applies when there is a sale or exchange, something...

Do I need to add the gift amount in my gross income?

Gifts are not taxable unless they exceed the lifetime exclusion and there is annual exclusion of 14k before it must be reported.

Do I apply those "liquidated" funds as income to her, or the estate? If the estate, do I request amended -Rs using the EIN?

You should consult with a tax attorney or probate attorney. There is generally a final return filed for the deceased for the year of death and...

How would inherited IRAs be retitled in these 2 different scenarios?

It simply has to designate that it is a inherited IRA, not necessarily the chain of inheritance.

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Tax audit questions and appeals evidence

there is not a way to answer this. Yes tax audit questions and appeals exist.

Tax situation for LLC

The reality of it is that it will not make a difference to your taxes. You should likely file a 1065 if there was income that was allocable to more...

What is the most efficient way to update a will with a simple disbursement change? Can I do a codicil myself in front of notary?

You can do a codicil, but it must adhere to all the same formalities as your will did, A notary signature is not enough, you need witnesses.

What to do if a Beneficiary of an IRA passed away before taking that RMD and named no subsequent beneficiary?

You should likely file the form asking for a waiver, otherwise 50% of the RMD could be penalized.